trap method

int trap(
  1. int pos
)

Ensures offset stays within valid range. pos is the proposed offset value. Returns clamped offset between 0 and maximum data points.

Implementation

int trap(int pos) {
  if (pos < 0) return 0;
  int max = test.bpmEntries!.length + pointsPerDiv - pointsPerPage;
  if (max < 0) max = 0;

  if (pos > max) pos = max;

  if (pos != 0) pos = pos - (pos % pointsPerDiv);

  print("$pos   $pointsPerPage   $pointsPerDiv");

  return pos;
}